USB: add a blacklist for devices that can't handle some things we throw at them.
This adds a blacklist to the USB core to handle some autosuspend and
string issues that devices have.
Originally written by Oliver, but hacked up a lot by Greg.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 74edaea..2f17468 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -11,6 +11,7 @@
#include <linux/timer.h>
#include <linux/ctype.h>
#include <linux/device.h>
+#include <linux/usb/quirks.h>
#include <asm/byteorder.h>
#include <asm/scatterlist.h>
@@ -685,7 +686,10 @@
/* Try to read the string descriptor by asking for the maximum
* possible number of bytes */
- rc = usb_get_string(dev, langid, index, buf, 255);
+ if (dev->quirks & USB_QUIRK_STRING_FETCH_255)
+ rc = -EIO;
+ else
+ rc = usb_get_string(dev, langid, index, buf, 255);
/* If that failed try to read the descriptor length, then
* ask for just that many bytes */